Automatic Traffic Control - Digisol DG-GS4528SE Management Manual

A T
UTOMATIC RAFFIC
C
ONTROL
Use the Traffic > Congestion Control > Auto Traffic Control pages to
configure bounding thresholds for broadcast and multicast storms which
can automatically trigger rate limits or shut down a port.
CLI R
EFERENCES
"Automatic Traffic Control Commands" on page 1007
u
C U
OMMAND SAGE
ATC includes storm control for broadcast or multicast traffic. The control
response for either of these traffic types is the same, as shown in the
following diagrams.
Figure 123: Storm Control by Limiting the Traffic Rate
Storm Alarm Storm Alarm
Traffic Traffic
Fire TRAP Fire TRAP
[kpps] [kpps]
StromAlarm StromAlarm
Alarm Fire Alarm Fire
ClearTRAP ClearTRAP
Threshold Threshold
（1～255kpps ） （1～255kpps ）
AlarmClear AlarmClear
Threshold Threshold
（1～255kpps ） （1～255kpps ）
The key elements of this diagram are described below:
Alarm Fire Threshold – The highest acceptable traffic rate. When
u
ingress traffic exceeds the threshold, ATC sends a Storm Alarm Fire
Trap and logs it.
When traffic exceeds the alarm fire threshold and the apply timer
u
expires, a traffic control response is applied, and a Traffic Control Apply
Trap is sent and logged.
Alarm Clear Threshold – The lower threshold beneath which a control
u
response can be automatically terminated after the release timer
expires. When ingress traffic falls below this threshold, ATC sends a
Storm Alarm Clear Trap and logs it.
When traffic falls below the alarm clear threshold after the release
u
timer expires, traffic control (for rate limiting) will be stopped and a
Traffic Control Release Trap sent and logged. Note that if the control
action has shut down a port, it can only be manually re-enabled using
Manual Control Release (see
– 257 –
C
HAPTER
TrafficControl TrafficControl
Apply Trap Apply Trap
Storm Alarm Storm Alarm
Fire TRAP Fire TRAP
Apply Timer Apply Timer
expired expired
Auto Storm Control Auto Storm Control
(0～300sec) (0～300sec)
page 259).
| Congestion Control
9

Automatic Traffic Control

Traffic without storm control Traffic without storm control
Traffic with storm control Traffic with storm control
StromAlarm StromAlarm
ClearTRAP ClearTRAP
TrafficControl TrafficControl
Release Trap Release Trap
Release Timer Release Timer
expired expired
(0～300sec) (0～300sec)
Time Time